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Carbon dioxide and methane in the Arctic atmosphere

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Abstract

Fifty flask air samples were taken during April 1986 from a NOAA WP-3D Orion aircraft which flew missions across a broad region of the Arctic as part of the second Arctic Gas and Aerosol Sampling Program (AGASP II). The samples were subsequently analyzed for both carbon dioxide (CO2) and methane (CH4). The samples were taken in well-defined layers of Arctic haze, in the background troposphere where no haze was detected, and from near the surface to the lower stratosphere. Vertical profiles were specifically measured in the vicinity of Barrow, Alaska to enable comparisons with routine surface measurements made at the NOAA/GMCC observatory. Elevated levels of both methane and carbon dioxide were found in haze layers. For samples taken in the background troposphere we found negative vertical gradients (lower concentrations aloft) for both gases. For the entire data set (including samples collected in the haze layers) we found a strong positive correlation between the methane and carbon dioxide concentrations, with a linear regression slope of 17.5 ppb CH4/ppm CO2, a standard error of 0.6, and a correlation coefficient (r2) of 0.95. This correlation between the two gases seen in the aircraft samples was corroborated by in situ surface measurements of these gases made at the Barrow observatory during March and April 1986. We also find a similar relationship between methane and carbon dioxide measured concurrenty for a short period in the moderately polluted urban atmosphere of Boulder, Colorado. We suggest that the strong correlation between methane and carbon dioxide concentrations reflects a common source region for both, with subsequent long-range transport of the polluted air to the Arctic.

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Authors and Affiliations

  1. Geophysical Monitoring for Climatic Change, Air Resources Laboratory/NOAA, 32S Broadway, 80303, Boulder, CO, U.S.A.

    T. J. Conway

  2. Cooperative Institute for Research in Environmental Sciences, University of Colorado/NOAA, Campus Box 449, 80309, Boulder, CO, U.S.A.

    L. P. Steele

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  1. T. J. Conway
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  2. L. P. Steele
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Conway, T.J., Steele, L.P. Carbon dioxide and methane in the Arctic atmosphere. J Atmos Chem 9, 81–99 (1989). https://doi.org/10.1007/BF00052826

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  • DOI: https://doi.org/10.1007/BF00052826

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